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Automation > Automation > Flashcards

Automation Flashcards

1
Q

What is an internal relay?

A

A computer generated device that has functions to control other devices

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2
Q

What is an internal timer?

A

A computer generated device that times in mS and can only be a on delay timer.

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3
Q

Internal counter?

A

Is a computer generated device that when an item or object passes through the device gets counted up and once reached a certain amount will perform a different function.

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4
Q

Pulse bit?

A

Is a computer generated device that will pulse and output and certain intervals to what it is set at.

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5
Q

What are the main 4 parts of a PLC?

A

Power supply
CPU (Central processing unit)
Input/Output Modules
Programming terminal
(5th is Rack)

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6
Q

What numbering system is based on 2 digits?

A

Binary

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7
Q

What numbering system is based on 8 digits? (0-7)

A

Octal

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8
Q

What numbering system is based on 10 digits?

A

Decimal

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9
Q

What numbering system is based on 16 digits

A

Hexadecimal

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10
Q

Which industry first used PLC’s?

A

Automotive industry

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11
Q

A PLC is a special kind of…?

A

Industrial computer

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12
Q

Most PLC’s are designed to be programmed in?

A

Ladder logic

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13
Q

A PLC power supply must be able to regulate voltage within?

A

5% of the required value

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14
Q

In a PLC all functions are performed by the?

A

CPU (Central Processing Unit)

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15
Q

Manufacturers use one of two devices to prevent a program from being accidentally deleted. What are they?

A

Software key and physical key

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16
Q

What is another name for the programming terminal?

A

Loading terminal

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17
Q

The PLCs terminal is used to?

A

a. Program the controller
b. Monitor the cpu and
c. Troubleshoot

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18
Q

Are NEMA symbols such as pushbuttons, limit switches or selector switches used in PLC ladder diagrams?

A

No. Only NO and NC contacts

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19
Q

How are contacts of a PLC ladder diagram addressed?

A

By a number/ contacts address

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20
Q

If a laptop or notebook computer were connected to a PLC the laptop or notebook computer would be referred to as the…

A

Programming terminal

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21
Q

In a ladder diagram each rung ends with a?

A

Coil

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22
Q

How are coils of a plc ladder diagram symbolized?

A

Brackets

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23
Q

What part of the PLC is referred to as the brains

A

CPU

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24
Q

What type of isolation is generally used to electrically separate outside voltages from the internal circuitry of the PLC?

A

Optical isolation

25
Q

What is connected across the AC input to help eliminate any voltage spikes that may occur on the line?

A

Metal Oxide Varistor (MOV)

26
Q

What part of the PLC connects the CPU to the real world input/output devices?

A

The input/ output modules

27
Q

If an output module controls a DC voltage what solid state device is used to connect the load to the line?

A

power phototransistor

28
Q

If an output module controls an AC voltage, what solid state device is used to connect the load to line?

A

Triac or Phototriac

29
Q

What are timers and counters in a PLC

A

Computer generated and internal relays

30
Q

Pushbuttons limit switches and float switches would be considered

A

Input devices

31
Q

When a PLC utilizes opto isolation what device is used to either signal the CPU that a voltage is present at the input terminal or the CPU to signal a solid state device to connect the line to load?

A

LED (Light emitting diode)

32
Q

The amount of current output modules can handle is generally

A

0.5A- 3A

33
Q

When may an interposing relay be used?

A

When the amperage of the load exceeds the rating of the output module

34
Q

If a PLC is used to start a 3 phase motor the output module is used to what?

A

Energize the motor starter coil

35
Q

A PLC recognizes internal relays and timer contacts by what?

A

The contacts address

36
Q

What are the 5 basic logic gates?

A

And
Or
NAND
NOR
Inverter

37
Q

Transistor transistor logic (TTL) operates on

A

5 Volts

38
Q

High transit logic (HTL) operates on what?

A

15 volts

39
Q

Most gate circuits are multi input what output devices?
Answer “what”

A

Single output

40
Q

How many input and output does the inverter have?

A

1 of each

41
Q

When an inverter gate is used is the input or output inverted?

A

Output

42
Q

Explain an AND gate

A

If all inputs are high the output is high
( Both inputs have to be high to have an output)

43
Q

Explain an OR gate

A

If one input is high the output is high
(Only one input has to be high to have an output, can be either or)

44
Q

Explain a NOR gate

A

If one input is high the output is low.
To get a high output both input have to be low

45
Q

Explain a NAND gate

A

If all inputs are high the output is low!
If both inputs are low the output will be high

46
Q

A logic gate in which the output is always the opposite the input is the

A

INVERTER

47
Q

What symbol is used to represent “INVERT” when NEMA or computer logic symbols are used?

A

X

48
Q

If an inverter is connected to the output of an AND gate what logic gate is formed?

A

NAND gate

49
Q

If an inverter is connected to the output of an OR gate what logic gate is formed?

A

NOR gate

50
Q

When using a two input AND gate what conditions of input must be met to get an output?

A

Both inputs must be high

51
Q

When using a two input OR gate what conditions of input must be met to have an output?

A

Either input may be high

52
Q

When using a two input NAND gate what conditions of input must be met to have an output?

A

Both inputs must be low

53
Q

When using a two input NOR gate what conditions of input must be met to have an output?

A

Both inputs must be low

54
Q

The gate that is referred to as the basic gate is the?

A

NAND gate

55
Q

A NOTO contact is from an ON or OFF delay timing relay?

A

Off delay

56
Q

What is the term that is typically used to describe the high and low settings of a float switch, pressure switch or a temperature switch?

A

Differential setting

57
Q

What devices could be used to monitor the current of a 3 phase motor?

A

Current transformer

58
Q

A control circuit that allows a piece of equipment to re start after a power interruption is called what?

A

Low voltage release

Automation (3 decks)

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